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Singer Katy Perry attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington. The dinner is an annual event attended by journalists, politicians and celebrities.

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Olympic Gymnist Gabby Douglas attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Emily Mortimer attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Piers Morgan, left, and Gerard Butler attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Patricia Arquette attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Kate Walsh attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Jessica Pare attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Michelle Dockery attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Sharon Stone attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Sophia Bush attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Sofia Vergara attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Olivia Munn attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actor Ed Helms attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Hayden Panettiere attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actor Matthew Perry attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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NFL player Victor Cruz and Elaina Watley attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actor Giancarlo Esposito attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actor Eric Stonestreet attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Shonda Rhimes and Kerry Washington attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Beth Behrs attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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CBS News' Gayle King attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actor Kevin McHale attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Model Chrissy Teigen and musician John Legend attend the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Amy Poehler attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Claire Danes attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Connie Britton attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Megan Hilty attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Robin Wright attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Actress Rebel Wilson attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Tracy Morgan attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Director Steven Spielberg attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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New York Mayor Michael Bloomberg talks with actress/singer Barabara Streisand during the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.

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Comedian Conan O'Brien delivers a comedy routine during the White House Correspondents' Association Dinner on April 27, 2013, in Washington.

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Actor Kevin Spacey attends the White House Correspondents' Association Dinner at the Washington Hilton on April 27, 2013, in Washington.